[Doc] Add documentation for new functions.

include/theme.h

@@ -141,6 +141,7 @@ void rofi_theme_property_free(Property *p);
 
 /**
  * @param p The property to free.
+ * @param data User data (unused)
  *
  * Make a newly allocted copy of the property.
  *

include/widgets/listview.h

@@ -273,8 +273,9 @@ void listview_toggle_ellipsizing(listview *lv);
 
 /**
  * @param lv Handler to the listview object.
+ * @param mode The ellipsize mode to set.
  *
- * Set ellipsize mode to start.
+ * Set ellipsize mode on the listview.
  */
 
 void listview_set_ellipsize(listview *lv, PangoEllipsizeMode mode);